From a consideration of odd-even intramolecular electron transfer processes in octahedrally co-ordinated transition metal complexes, two relationships have been derived. The first correlation describes 71 —> y3 optical electron transfer bands of the complexes K20sC l6 , K2IrCl6 , K2PtCl6 , K2PtCl4 as a function of the respective 35C1 nuclear quadrupole coupling constants. The second rela­ tions...

This paper gives an elementary introduction to time differential perturbed angular correlation of y-rays emitted from excited nuclei with particular reference to nuclear quadrupole interactions. We start with a comparison to other techniques such as nuclear quadrupole resonance and the Mössbauer effect, quote all necessary formulae, describe a typical spectrometer, list suitable isotopes, and f...

NQR studies o f a number of molecular complexes with p-chloronitrobenzene and o-chloronitrobenzene as acceptors and different hydrocarbons as donors were carried out. A linear relationship between the NQR shift and the ionization potentials o f the donors is obtained. Maksyutin’s idea o f a positive shift with respect to acceptors having a quadrupolar nucleus is shown to hold in those systems. ...

Nuclear quadrupole resonance ( N Q R ) has provided a valuable tool for investigating the local structural order in semiconducting glasses. Measurements of N Q R lineshapes and spin-lattice relaxation times help elucidate the local structural order and the unusual vibrational properties, respectively, o f these glasses. In addition, N Q R lineshape measurements on samples that are made under co...

Direct NQR signals from the light nuclei H, B, N use to be weak; their detection is difficult. For these light nuclei nuclear quadrupole double resonance (DNQR) methods are preferable in which the sensitivity is enhanced due to the thermal contact of two spin-systems and indirect detection. The higher the initial magnetic field B0, the better is the DNQR sensitivity. Apart from this, the DNQR s...

Detection of explosives has the flavor of those mathematical problems that are not invertible. It is easier to hide explosives than to find them. Many approaches have been proposed and executed for the remote detection of explosives, contraband materials, weapons of mass destruction, currency, etc. Most detection technologies suffer from a common problem: the features they look for, such as dis...